Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Imperceptible; inappreciable: an insensible change in temperature.
  • adj. Very small or gradual: insensible movement.
  • adj. Having lost consciousness, especially temporarily; unconscious: lay insensible where he had fallen.
  • adj. Not invested with sensation; inanimate: insensible clay.
  • adj. Devoid of physical sensation or the power to react, as to pain or cold; numb.
  • adj. Unaware; unmindful: I am not insensible of your concern.
  • adj. Not emotionally responsive; indifferent: insensible to criticism.
  • adj. Lacking meaning; unintelligible.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Unable to be perceived by the senses.
  • adj. Incapable or deprived of physical sensation.
  • adj. Unable to be understood; unintelligible.
  • adj. Lacking sense or intelligence.
  • adj. Incapable of mental feeling; indifferent.
  • adj. Incapable of emotional feeling; callous; apathetic.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Destitute of the power of feeling or perceiving; wanting bodily sensibility; unconscious.
  • adj. Not susceptible of emotion or passion; void of feeling; apathetic; unconcerned; indifferent; ; -- often used with of or to.
  • adj. Incapable of being perceived by the senses; imperceptible. Hence: Progressing by imperceptible degrees; slow; gradual.
  • adj. Not sensible or reasonable; meaningless.
  • adj. Incapable of feeling a specific sensation or emotion.

from The Century Dictionary and Cyclopedia

  • Not perceptible by the senses; imperceptible; inappreciable.
  • Not sensible to the mind; not consciously apprehended or appreciated; unconscious.
  • Without the power of feeling or sensation; without corporeal sensibility.
  • Not susceptible of emotion or passion; void of feeling or tenderness: as, to be insensible to the sufferings of others.
  • Void of sense or meaning; meaningless.
  • Dull, torpid, senseless, unconscious, unfeeling, unsusceptible, indifferent, hard, callous.
  • n. One who is lacking in sensibility; a thoroughly apathetic person.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. barely able to be perceived
  • adj. unaware of or indifferent to
  • adj. incapable of physical sensation
  • adj. unresponsive to stimulation

Etymologies

Middle English, from Old French, from Latin īnsēnsibilis, imperceivable : in-, not; see in-1 + sēnsibilis, perceptible; see sensible.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin insensibilis (Wiktionary)

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